Used Honing Machine - Internal - Vertical for sale (71,709)

Condition: used, machine/vehicle number: 008469, X axis working area: 3050 mm Y axis working area: 850 mm Number of controlled axes: 3 axes Njdpsywafujfx Afnocu Total number of drilling spindles: 19 Total number of tool changer positions: 4

Condition: good (used), Year of construction: 2011, functionality: fully functional, machine/vehicle number: 135001, travel distance X-axis: 1,350 mm, travel distance Y-axis: 620 mm, travel distance Z-axis: 810 mm, rapid traverse X-axis: 30 m/min, rapid traverse Y-axis: 30 m/min, rapid traverse Z-axis: 30 m/min, feed rate X-axis: 15 m/min, feed rate Y-axis: 15 m/min, feed rate Z-axis: 15 m/min, nominal power (apparent): 35 kVA, controller manufacturer: HEIDENHAIN, controller model: ITNS 530, total height: 2,900 mm, total length: 7,000 mm, total width: 2,700 mm, table width: 620 mm, table length: 1,550 mm, overall weight: 10,000 kg, spindle speed (max.): 12,000 rpm, operating hours of spindle: 6,510 h, distance table to spindle center: 900 mm, number of slots in tool magazine: 40, tool length: 300 mm, tool diameter: 80 mm, input voltage: 400 V, input frequency: 50 Hz, input current: 63 A, Equipment: chip conveyor, documentation/manual, KUNZMANN BA 1350 CNC Vertical Machining Center - Spindle bearing diameter, front: 70 mm, rear: 60 mm - Distance between spindle and table: min. 90 mm / max. 900 mm - Distance between spindle center and machine frame: 655 mm Njdpfjzdp Ehex Afnocu - Max. tool diameter with occupied positions: 80 mm, with free adjacent position: 125 mm - Table with 6 grooves - Includes dividing head (4th and 5th axis - manufacturer WALTER, type: TANIH 200) - With LANG 5-axis clamping system - Also includes RENISHAW measuring probe, a chip conveyor, and various documents - Note: without the machine vise located on the clamping surface! Note: The item must be collected between July 27th and July 30th, 2026, on a date to be agreed upon. FCA D-71364 Winnenden - loaded onto a truck.

Condition: good (used), Year of construction: 1997, functionality: fully functional, machine/vehicle number: 11734, travel distance X-axis: 600 mm, travel distance Y-axis: 450 mm, travel distance Z-axis: 500 mm, rapid traverse X-axis: 10 m/min, rapid traverse Y-axis: 10 m/min, rapid traverse Z-axis: 10 m/min, feed length X-axis: 10,000 mm, feed length Y-axis: 10,000 mm, feed length Z-axis: 10,000 mm, controller manufacturer: HEIDENHAIN, controller model: TNC 426, total height: 2,200 mm, total length: 3,000 mm, total width: 2,400 mm, table width: 528 mm, table length: 900 mm, overall weight: 5,000 kg, mount diameter: 40 mm, input voltage: 400 V, input frequency: 50 Hz, input current: 23 A, Equipment: documentation/manual, HERMLE UWF 902 H CNC Vertical Machining Center - Connection: 16 kVA - Tool holder: SK 40 - Incl. 30-position tool changer - Incl. documentation and a RENISHAW measuring probe Note: The item must be collected between July 27th and July 30th, 2026, on a date to be determined. Ncodpfozdpz Asx Afnju FCA D-71364 Winnenden – loaded onto a truck.

Condition: good (used), Year of construction: 2008, functionality: fully functional, Year of manufacture: 12/2008 Control system: FANUC Series 31i-Model A5 Spindle taper: BT30 Tool magazine: 21 positions Machine weight: 2,100 kg Power supply: 3-phase, 200/220 V, 50/60 Hz Power consumption: 10 kVA CE marking: yes Country of origin: Japan Travel and working ranges X-axis travel: 500 mm Y-axis travel: 400 mm Z-axis travel: 330 mm Rapid traverse X/Y/Z: up to 54 m/min Max. spindle speed: up to 24,000 rpm (as per nameplate) Max. table load: 300 kg Included accessories Nodszgvwiopfx Afnocu The machine includes approximately 50 collets of various sizes. The rotary table / 4th axis located in the machine is not included in the sale.

Condition: good (used), Year of construction: 2007, functionality: fully functional, Technical specifications: Machine weight: 4100 kg Longitudinal table travel – X-axis: 835 mm Transverse table travel – Y-axis: 510 mm Vertical table travel – Z-axis: 510 mm Spindle speed: 20-10000 rpm Njdpfxjzgvixj Afnjcu Max. workpiece weight: 600 kg

Condition: used, Year of construction: 2001, x-travel 600 mm y-travel 700 mm z-travel 600 mm Ncedpfjzdvglsx Afnou Control Heidenhain Millplus weight of the machine ca. 9 t

Condition: used, Year of construction: 2004, turning diameter 250 mm Nsdpfjzdvgfex Afnecu swing diameter 250 mm turning height 250 mm Control Siemens Sinumerik 840 D total power requirement 60 kW weight of the machine ca. 9 t

Condition: good (used), Year of construction: 2009, functionality: fully functional, 3 x Hyundai-Kia / WIA VX500 CNC Vertical Machining Centers A total of 3 identically equipped Hyundai-Kia / WIA VX500 CNC vertical machining centers are for sale. All three machines are located next to each other at the same site and are identically equipped, each including a mounted 4th axis / NC rotary table on the machine table. Manufacturer: Hyundai-Kia Machine / WIA Corporation Model: VX500 / VX500 F21i-MB Machine Type: CNC Vertical Machining Center Control: FANUC Series 21i-MB Number of Machines: 3 units Year of Manufacture: 2007 & 2009 Tool Clamping: BT40 / NT40 Tool Magazine: 30-position 4th Axis: Yes, each mounted Machine Weight: approx. 7,000 - 7,500 kg per machine Technical Data per Machine Travel X-axis: 1,060 mm Travel Y-axis: 510 mm Travel Z-axis: 635 mm Table Size: 1,200 x 500 mm Max. Table Load: 800 kg Spindle Speed: 80 - 8,000 rpm Optional / possible according to documentation: up to 10,000 rpm Spindle Power: 15 / 11 kW Spindle Clamping: BT40 / NT40 Rapid Traverse X/Y: 36 m/min Rapid Traverse Z: 30 m/min Working Feed: 1 - 15,000 mm/min Smallest Input Unit: 0.001 mm Positioning Accuracy according to documentation: ±5 µm over full travel Repeatability Accuracy according to documentation: ±2 µm Tool Changer Automatic Tool Changer Tool Magazine: 30 positions Tool Call: Random Max. Tool Diameter: 90 mm Max. Tool Length: 300 mm Max. Tool Weight: 8 kg Tool Change Time Tool-to-Tool: approx. 3 seconds Chip-to-Chip Time: approx. 7 seconds Equipment per Machine FANUC Series 21i-MB CNC Control 4th Axis / NC Rotary Table, mounted Automatic Tool Changer 30-position Tool Magazine BT40 / NT40 Tool Clamping Coolant System Spindle Cooling / Main Shaft Cooling Unit AR Filtrazioni Oil Mist Extractor / Filtration System Full Protective Enclosure Work Area Lighting Electronic Handwheel / MPG Load Meter Spindle Override Feed Override Feedrate Override Chip Conveyor Function on Control Panel Automatic Door Function on Control Panel Tool Holders visible in the Magazine Clamping Devices / Vise or Fixture visible in the Work Area Description The machines are suitable for general CNC milling operations, toolmaking, jig and fixture manufacturing, single-part production, small-batch production, and precise machining operations. Due to the mounted 4th axis, the machines are suitable not only for conventional 3-axis milling but also for 3+1 machining. All three machines are located next to each other and can be offered together as a package or, if necessary, individually. Nedpfx Afszdv R Renocu

Condition: good (used), Year of construction: 2007, functionality: fully functional, machine/vehicle number: 17405, travel distance X-axis: 550 mm, travel distance Y-axis: 410 mm, travel distance Z-axis: 450 mm, rapid traverse X-axis: 50 m/min, rapid traverse Y-axis: 50 m/min, rapid traverse Z-axis: 50 m/min, feed rate X-axis: 50 m/min, feed rate Y-axis: 50 m/min, feed rate Z-axis: 50 m/min, nominal power (apparent): 36 kVA, controller manufacturer: MATSUURA, controller model: G-TECH 840 DI, total height: 3,500 mm, total length: 6,000 mm, total width: 5,000 mm, overall weight: 15,000 kg, spindle speed (min.): 50 rpm, spindle speed (max.): 15,000 rpm, number of slots in tool magazine: 240, mount diameter: 40 mm, tool length: 300 mm, tool diameter: 80 mm, tool weight: 10,000 g, input voltage: 415 V, input frequency: 50 Hz, input current: 50 A, Equipment: chip conveyor, MATSUURA MAM 72-25 V CNC Universal Machining Center - Tool holder: SK 40 - B-axis travel: -110°/+110° - C-axis travel: 360° - Distance between pallet surface and spindle reference line: -20 to 430 mm - Distance between B-axis center and spindle reference line: 4 - 410 mm - Distance between B-axis center and spindle reference line: -10 mm - Distance between pallet center line and bed 0-point: 265 mm - Distance between pallet center line and Y 0-point: 180 mm - Internal diameter of the spindle bearing: 70 mm Nodpfx Afsy I Sfhenocu - Tool clamping force: 7.0 kN - Feed rate B-axis: 30/min - Feed rate C-axis: 50/min - Max. tool diameter: 80 mm, with free secondary stations: 150 mm The machine is equipped with a chip conveyor and a coolant system. Note: includes the tool holders located on the tool changer! Note: the machine can be transported on a truck up to 2700 mm wide! Note: the item must be picked up between August 24 and August 27, 2026, on a date to be determined. FCA D-61352 Bad Homburg - loaded onto a truck.

Condition: good (used), Year of construction: 2015, functionality: fully functional, machine/vehicle number: 19859, travel distance X-axis: 630 mm, travel distance Y-axis: 560 mm, travel distance Z-axis: 510 mm, nominal power (apparent): 44 kVA, controller manufacturer: MATSUURA, controller model: G-TECH 31i, total height: 3,200 mm, total length: 7,000 mm, total width: 6,000 mm, rotary table diameter: 500 mm, overall weight: 15,000 kg, spindle speed (max.): 12,000 rpm, operating hours of spindle: 12,315 h, number of slots in tool magazine: 60, mount diameter: 40 mm, input voltage: 415 V, input frequency: 50 Hz, input current: 62 A, Equipment: chip conveyor, documentation/manual, MATSUURA MX-520 Universal Machining Center - Tool holder: SK 40 - A-axis travel: -125° to +10° - C-axis travel: 360° - 5-axis NC rotary table: 500 mm diameter - Includes the tool holders shown in the photos! - Includes coolant system, extraction system, and chip conveyor Note: The machine vise shown on the rotary table is not included in the scope of delivery! Note: The machine can be transported on a truck with a width of up to 2500 mm! Note: The item must be collected between August 24th and August 27th, 2026, on a date to be agreed upon. FCA D-61352 Bad Homburg - loaded onto a truck Nsdpfoy I Sq Rjx Afnecu

Condition: used, Year of construction: 2012, functionality: fully functional, machine/vehicle number: MV0009-001573, travel distance X-axis: 762 mm, travel distance Y-axis: 435 mm, travel distance Z-axis: 510 mm, nominal power (apparent): 33 kVA, overall weight: 5,000 kg, type of input current: three-phase, Doosan DNM 400 – Vertical Machining Center. CNC milling machine for precise metalworking. Suitable for drilling, milling, and tapping operations. Reliable and accurate, ideal for industrial use. Nodpfx Aey Exg Hsfnscu

Condition: used, Year of construction: 1983, workpiece diameter 250 mm centre distance 0 mm honing length max. mm max. module 5 Gear Ø, min./max. 10 / 250 mm Module range 1 - 5 Length of teeth / max. table stroke 500 mm Height of centres of tailstocks 220 mm Max. weight of workpiece 50 / 100 kg Honing head swivelling +/- 35 ° Speeds of honing tool 20 - 500 rpm Size of honing tool, Ø x width 300 x 40 mm Workpiece speeds 500 - 3,000 rpm Total adjustment of cross slide 270 mm Rapid traverse of cross slide 50 mm Infeed travel of cross slide, mechanical 1 - 8 mm/Ø Roughing / finishing infeed 1 - 29 / 0.2 - 2.8 mm/sec Table speeds, hydraulic 0 - 6 m/min Total electrical load 5.5 kW - 380 V - 50 Hz Weight 3,200 kg Nsdpfx Afjt Hwzpjnecu Accessories / Special Features * Working parameters can be preset using counters and control units. Automatic working process with workpiece counter. * All roughing and finishing infeeds can be adjusted by a decade switch; as well as by table reverse times and fast infeeds with preset times (1sec = Ø 0.04 mm), set on a potentiometer. Ampere display, etc. * Convex honing and conical honing are possible via templates. Asymmetric honing is also possible if the workpiece is prepared appropriately (i.e. pre-shaped). * Separate honing oil unit with magnetic separator and fine filter. * Mechanical tailstocks for manual loading. * Oil mist separator. * Sliding doors with foot switch. * Separate hydraulic unit. Condition : Good. Machine can be inspected under power. Delivery : Ex stock, as inspected. Payment : Net, after conclusion of contract. We have a large selection of gear machines available. Please let us know your requirements.

Condition: used, Year of construction: 2005, x-travel 750 mm y-travel 560 mm z-travel 600 mm Control HEIDENHAIN iTNC 530 total power requirement 70 kW weight of the machine ca. 11.000 kg dimensions of the machine ca. m D E C K E L M A H O (Germany) Vertical CNC Machining Centre with high speed linear drives in 3 Axis and in double column design for high precision work Model DMC 75 V LINEAR Year 2005 _____ Working range: Longitudinal stroke X Axis 750 mm Vertical stroke Z Axis 600 mm Cross stroke Y Axis 560 mm Table clamping size 950 x 650 mm Max. Table load 1.000 kg Max. height of workpiece 600 mm Tool holder Cone HSK 63 Spindle (KESSLER) speeds 18,000 rpm Torque, max. 86/130 Nm Spindle run-up time / stop time 3.2 sec Feeds / Quickfeeds, X, Y and Z Axes max. 90,000 mm/min Feed force 11.000/9.500 N Axis acceleration, X / Y / Z Axes 15 / 12 / 18 m/s Spindle drive 25/35 kW Total electrical load, approx. 75 kW - 400 V - 50 Hz Weight, approx. 11.000 kg Accessories / Special Features: This machine is very interesting because of the very stable double Column Portal Design and with the modern linear technology for fast and powerful high precision work. * HEIDENHAIN modern CNC Control System Model iTNC 530 in 3 axes, with all the usual options, cycles and sub programmes. * Table moves only in x axis and allows a comfortable loading of heavy workpieces * 30-position disktype tool magazine for max. tool Ø 100, 140 and 200 mm x max. length 300 mm. Max. weight 10 kg. Cut-to-cut time 6 sec. Pick-Up by main spindle. Nsdpfx Afet Hw Trsnscu * BLUM tool-breakage control, Blum Receiver for RENISHAW –Head, no head available. * Double linear motors ensure very fast feed motions and strong feed power, equipped with own cooling system. * KESSLER Milling Spindle, Liquid-cooled, steplessly programmable up to 18.000 rpm * Completely covered working area with 2 sliding doors, one with spin-type bull-eye. * KNOLL Coolant device with scraper-type chip conveyor and pressure pomp. * Spindle working hours approx. 23.000 h Condition : Very good. Machine can soon be inspected under power. Delivery : Ex stock, as inspected. Payment : Net, after conclusion of contract.

Condition: used, Year of construction: 1995, max. wheel diameter 80 mm gear width 120 mm max. module 3 min. module 1 control SIEMENS 840 C total power requirement 30 kW weight of the machine ca. 7500 t dimensions of the machine ca. m L I E B H E R R CNC – Controlled Gear Hobbing Machine Type LC 82 Baujahr 1995 Ser.-Nr. 0836 _____ Gear-Diam. max. 80 mm Module Range 1 - 3 Helix Angle +/- 45 ° Distance Table Center to Tool Center 15 – 160 mm Hobbing Head Slide stroke vertical 250 mm Tangential Travel / Shift Travel of Tool slide 180 mm Minimum Number of Teeth 3 (!) Hob Size max. Ø x length approx. 90 - 200 mm Taper of Hob spindle HSK 50 A Workpiece Clamping length (table/Tailstock) 250 mm Infeed rates axial/radial/tangential/ 20/4/5/ mm/WP rev. Hob speed steplessly adjustable 0 – 800 rpm Hob Spindle Drive 8 kW - Total Load approx. 30 kW - 400 V – 50 Hz Total weight of Machine approx. 7.500 kg Special attachments / accessories: • SIEMENS - CNC-Control Model 840 C for 6 axis (i.e. Hob drive/table drive/ swivel angle of hob head/ Radial axis/Axial Axis/ Tangential Axis ) with a surface especially designed for the gear manufacturing with error display function. • Automatic and contactless tooth meshing device to adjust the hob into workpiece. • Automatic Shifting of hob slide. • Automatic Workpiece handling system Model SSL for high speed loading and unloading of Workpieces, consisting of a steel chain3,, for workpiece carriers and 3-fold WP-Gripper for blanks, Nedjt Hw R Djpfx Afnjcu for the machining position and for unloading of finished parts onto the steel band. Actual Workpiece size to be machined: approx.. Ø 30 x 120 mm length, helix gear sprocket. Clamping of workpiece between centers by a mechanical, cam controlled quill in tailstock. • complete workarea protection with one sliding door, chip conveyor, small coolant device, oil dust Absorber, WP Carrier, etc. The Machine can be also used for dry cutting. Condition : Satisfactory to Good . Machine can be inspected under power here in stock. Delivery : Ex stock, as inspected. Payment : Net, after conclusion of contract.

Condition: used, Year of construction: 2000, x-travel 800 mm y-travel 500 mm z-travel 510 mm total power requirement 60 kW weight of the machine ca. 10 t dimensions of the machine ca. m Njdet Hwyrjpfx Afnjcu

Condition: used, Year of construction: 1998, x-travel 800 mm y-travel 500 mm z-travel 510 mm Ncjdpfxot Hwtfj Afnju total power requirement 60 kW weight of the machine ca. 10 t dimensions of the machine ca. m

Condition: used, Year of construction: 1987, x-travel 500 mm y-travel 380 mm z-travel 300 mm Control FANUC Nsdpot Hw H Ejfx Afnocu total power requirement 12 kW weight of the machine ca. 2300 kg dimensions of the machine ca. m

Condition: used, Year of construction: 1990, x-travel 500 mm y-travel 300 mm z-travel 350 mm Nedpfx Aot Hwy Esfnecu total power requirement 12 kW weight of the machine ca. 3800 kg dimensions of the machine ca. m

Condition: used, Year of construction: 1996, workpiece diameter 240 mm Ncsdpfxst Hwvmo Afnou centre distance 0 mm honing length max. 500 mm max. module 5 total power requirement 12 kW weight of the machine ca. 5000 kg dimensions of the machine ca. m

Condition: used, Year of construction: 1997, x-travel 800 mm y-travel 400 mm Njdpet Hwx Iofx Afnscu z-travel 350 mm total power requirement 40 kW weight of the machine ca. 8 t dimensions of the machine ca. m

Condition: used, Year of construction: 1969, grinding height 60 mm grinding width 120 mm grinding wheel diameter 600 mm grinding length mm workpiece height 60 mm total power requirement 50 kW weight of the machine ca. 7000 kg dimensions of the machine ca. m D I S K U S (Germany) Double Side Vertical Spindle Surface Grinder, C-Frame Design, with Rotary Workpiece Feeding System and Automatic Dressing Device Ncjdot Hw N Hopfx Afneu Model DDS 600 CR-A Year 1969 Serial-No. 6672 _____ Grinding wheels Ø x bore, each 600 mm Grinding wheels height x width, approx. 60 mm Workpiece dimensions: Grinding height x grinding width, approx. 60 x 120 mm Vertical adjustment of each grinding head 150 mm External Ø of workpiece carrier disk, approx. 810 mm Feeds of rotary workpiece feed system 14 – 145 mm/sec Grinding wheel speeds, each, infinitely variable 765 rpm (24 m/s) Grinding spindle drive, each 22 kW Total electrical load, approx. 50 kW - 380 V - 50 Hz Total weight, approx. 7,000 kg Accessories / Special Features: * Rotary workpiece feed system with infinitely variable speed adjustment prepared with workpiece carrier disk approx. dia. 800 mm with relevant workpiece shaped pockets and after the grinding the parts will be automatically sorted out and collected in a collector box. * IONIC – Size Control Unit Model Nr. 9 So with measuring probe for the ground workpieces and with signal for the hydraulic infeed of the grinding wheel when size is not in order. * Automatic Dressing Device for the grinding wheels, hydraulically operated and with the automatic return of the grinding wheels after dressing cycle to the previously adjusted position and to continue the working cycle. Dressing cycle can be presetted by a timer or a manual release. * Manually operated infeed device of the Spindle slide to optimal workpiece thickness. * Spindle drives controlled by Ampere-Meters. * Separate switch cabinet. * Separate hydraulic unit. * Various carrier disks, etc. * Safety covers. * Central lubrication. * Large Coolant device with paperbandfilter This machine is ideal for double-sided simultaneous grinding of parallel workpiece surfaces by continuous method, for maximum output and accuracy in mass production (e.g. Piston rings, washers, hydraulic parts, and other punched parts.) Condition : Good . Machine can be inspected under power. Delivery : Ex stock, as inspected. Payment : Net, after conclusion of contract.

Condition: used, Year of construction: 2001, x-travel 630 mm y-travel 500 mm z-travel 500 mm Control CNC total power requirement 13 kW Ncsdjt Ii Iwspfx Afneu weight of the machine ca. 4,5 t dimensions of the machine ca. m

Condition: used, Year of construction: 1969, rotary table diameter 1000 mm grinding height 500 mm grinding head - power requirement 15/5,5 kW total power requirement 30 kW weight of the machine ca. 18 t dimensions of the machine ca. m S I E L E M A N N (Germany) Hydraulic Rotary Table Internal and Face Grinding Machine with two grinding heads and with horizontal workpiece clamping Model RFsB 100 Year 1969 / fully reconditioned by the manufacturer in 1990 _____ Max workpiece Ø 1,000 mm Max. height of workpiece, approx. 400 mm Mounting height under grinding spindles approx. 500 mm Grindable Bore Ø, approx. 50 – 900 mm Max. Workpiece weight approx.. 900 kg Distance between Table bore and column 1.150 mm Table Ø / Face plate Ø, approx. 1,000 mm Table speeds, hydraulic, infinitely variable, right/left 5 – 60 rpm Table/workpiece infeed, 5 steps 0.0025 – 0.025 mm/stroke Table stroke approx. 500 mm Distance between grinding spindle and machine body 600 mm Surface Grinding Head Ø (Segmented wheel) 450 mm Grinding slides stroke, max. 500 mm Grinding slide speeds, infinitely variable 0.2 – 1 m/m Max. Internal Grinding spindle Ø 140/100 mm Grinding cup wheel Ø, up to approx. 200 mm Motor for Surface Grinding 15 kW / Motor for Internal Grinding Spindle 5,5 kW Total electrical load, approx. 30 kW - 380 V - 50 Hz Weight, approx. 18,000 kg Accessories / Special Features • The rotary table carries the workpiece and is also actuating the automatic grinding infeed • The relevant Grinding head can be swivelled in by turning the Column (hydraulic lift) so the workpieces can be ground in one setting with exact angles. • Built-on magnetic face plate, Ø approx. 1,000 mm, with 5 T-slots and stepless adjustment for the magnetism Nsdpfx Afeu Su Apsnecu • Automatic workpiece infeed, with automatic depth stop. • Separate Height adjustment of internal grinding head, Grinding spindle Ø 100 mm. • Dressing devices mounted on each grinding head, Separate Switch Cabinet and hydraulic unit, • No Coolant Device available This machine is ideal for grinding bulky and heavy workpieces like housings, gears (!) bearing rings, cylindrical knives, etc. Condition: Good. Machine can be inspected soon under power Delivery : Ex stock as inspected. Payment : Net, after conclusion of contract.

Condition: used, Year of construction: 1977, max. wheel diameter 400 mm Ncsdpfx Afst Hw Hxsnou gear width 280 mm max. module 1 min. module 4 total power requirement 15 kW weight of the machine ca. 6000 kg dimensions of the machine ca. m

Condition: used, Year of construction: 2003, x-travel 1000 mm y-travel 800 mm Njdpjt Hw Hrofx Afnscu z-travel 700 mm Control HEIDENHAIN iTNC 530 total power requirement 50 kW weight of the machine ca. 16 t dimensions of the machine ca. m